layout.json

{
 "info": {"version": 1, "license": "GPL-2.1-or-later", "author": "Cyril Hrubis <metan@ucw.cz>"},
 "layout": {
  "cols": 2,
  "align": "fill",
  "cfill": "1, 0",
  "cpad": "3 * 0",
  "border": "none",
  "widgets": [
   {
    "rows": 2,
    "align": "fill",
    "rfill": "1, 0",
    "border": "none",
    "widgets": [
     {"align": "fill", "type": "pixmap", "uid": "map_view", "w": 400, "h": 300},
     {
      "cols": 3,
      "border": "none",
      "widgets": [
       {"type": "label", "text": "GPS:", "tattr": "bold"},
       {"type": "label", "text": "unknown", "uid": "gps_status"},
       {"type": "label", "text": "+-??m", "uid": "gps_error"}
      ]
     }
    ]
   },
   {
    "rows": 7,
    "valign": "fill",
    "widgets": [
     {"type": "color_scheme_switch", "align": "fill"},
     {"type": "button", "btype": "up", "align": "fill", "on_event": "move_up_event"},
     {"type": "button", "btype": "down", "align": "fill", "on_event": "move_down_event"},
     {"type": "button", "btype": "left", "align": "fill", "on_event": "move_left_event"},
     {"type": "button", "btype": "right", "align": "fill", "on_event": "move_right_event"},
     {"type": "button", "btype": "zoom_in", "align": "fill", "on_event": "zoom_in_event"},
     {"type": "button", "btype": "zoom_out", "align": "fill", "on_event": "zoom_out_event"}
    ]
   }
  ]
 }
}